Bleached Strap Grey vs Dark Green BS381C/641

How close are they?

ΔE 6.2, close: similar, with a visible difference side by side. Dark Green BS381C/641 is a little lighter, more saturated than Bleached Strap Grey.

Can I use Dark Green BS381C/641 instead of Bleached Strap Grey?

Usually, if you are not matching paint already on the model. Close match (ΔE 6). Dark Green BS381C/641 is a little lighter, more saturated than Bleached Strap Grey.

Can I use Bleached Strap Grey instead of Dark Green BS381C/641?

The same difference applies the other way round: Bleached Strap Grey is a little darker, more muted.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.